Two parts were commented out:
- _writeStopped: This is because _xoffSentToCatchUp references this variable
and the feature is sort of half implemented/disabled.
- _clearChar: This is because some comments still reference this, it's part
of the work needed to do better line redrawing.
This is needed so that resize is still performant. Now the list size is only
rebuild (O(n)) when it goes beyond 40 entries of the initial max length. The
List is also rebuilt when the size shrinks below 120 of the actual backing max
length (init_max_length + 40 - 120).